Flue section for providing balanced draft



Nov. 24, 1953 E. J. ARTIS 2,660,162

- mm SECTION FOR PROVIDING BALANCED DRA T Filed May 1, 1950 Edward J. A rtis IN V EN TOR.

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Patented Nov. 24, 1953 FLUE SECTION FOR PROVIDING BALANCED DRAFT Edward J. Artis, Boise, Idaho Application May 1, 1950, Serial N 0. 159,349 2 Claims. (01. 12es07) The present invention relates to improvements in draft duct flue sections and more particularly to the type which provides a balanced draft damper.

An object of this invention is to provide a flue section that utilizes the flue gases within the duct to balance the draft through the duct.

A further object of this invention is to provide a balanced draft flue section which eliminates the necessity of using the conventional type of damper which admits air from outside of the duct into the flue pipe to balance the draft.

A still further object of this invention is to provide such means that is positive in operation for providing a balanced draft, easily installed in the flue duct of a heating system and easily disconnected therefrom, particularly economical of manufacture, relatively simple, and of general superiority in serviceability.

Various other objects and advantages will be apparent from the detailed description to follow.

The best form in which I have contemplated applying my invention is illustrated in the accompanying drawings, wherein:

Figure 1 is a side elevational view of the present invention;

Figure 2 is a vertical transverse sectional View taken substantially along line 2-2 of Figure 1;

Figure 3 is an end view of the present invention showing the baflle positioned therein; and

Figure 4 is a horizontal transverse sectional view taken substantially along line 44 of Figure 2.

Referring more particularly to the drawings wherein like numerals designate like parts throughout, numeral Ill designates generally the balanced damper or flue section. The flue section l may be manufactured of any suitable flue duct stock such as stove pipe steel. The flue section IE) is provided with a male end connection M at one end and a female end connection l2 at its other end. The male connection I l may be provided by simply crimping the end of the flue section It. The tubular portion l6 of the flue section II] is provided with two large ports or apertures l8 which have their centers lying on a common element of the tubular member. Secured to the exterior of the tubular portion I6 is a housing or casing 20 preferably of rectangular shape, and which may be fixed to the tubular portion l6 by any desired means, such as by welding.

The casing 29 consists of a longitudinal outer wall or web portion 22, a pair of side walls or flanges 24 and a pair of end walls 26. The side walls 24 are integral with the longitudinal wall and have arcuate flanges 28 for securing to the flue section [0. The end walls 26 have a pair of bent elements 30 and 32 secured thereto for attaching to the longitudinal wall 22 and tubular portion [6, respectively. The casing 20 is secured to the flue duct so that it completely encompasses the pair of ports i8.

The longitudinal wall 22 is provided with a port 34. A cover plate 36 is rotatably secured to the wall 22 by means of a pin 38 and has a bent end portion to for manual movement of the plate 35 with respect to the wall 22;

A vertically inclined concavo-convexed baiile 32 is secured at its upper end to the inner periphery of the tubular portion l6 above the upper of the apertures I8 and its lower end terminating above the lower of the apertures l8.

From the foregoing description it is believed that the operation of the balanced damper will be readily understood. With the flue section Ii) positioned in the flue of a heating system, the flow of gases through the flue section will be in the direction shown by the arrows. It will be noted that the baifie d2 extending into the direction of the source of the gases will deflect a predetermined portion of the flue gases into the port I8 adjacent thereto. The gases will pass from this port through the casing 20 to the port It adjacent the inlet of the flue section if] and back into the flow of flue gases. The bafile 42 is of sufficient length so that it will not set up a venturi effect drawing the flue gases through the adjacent port rather than deflecting them out through the adjacent port. When the draft in the tubular portion it increases substantially, the flow deflected by the bafiie into the adjacent port and back through the port adjacent the inlet entering the flow of gases in substantially the opposite directron also increases, thus causing a diminished draft. The greater the draft increase the greater will be the flow directed in an opposite direction for diminishing the draft.

It will be noted that with the present invention the feature of admitting exterior cool air to decrease the draft is eliminated. The port i ri the outer casing is provided as an inspection hole. If the heating unit burns with too much noise or pulsation, this cover may be partly opened to give quieter operation.

Some changes may be made in the construction and arrangement of the parts of my device without departing from the real spirit and purpose of my invention.

Having described the invention, what is claimed as new 1s:

1. A flue section comprising a vertical tubular duct having upper and lower aligned apertures, a

casing secured to the outer periphery of the duct and including a channel member having side flanges secured to the outer periphery of the duct and a web portion joining said flanges and spaced radially outwardly from the duct and positioned 5 over said apertures, the ends v0i said. channel member being closed, whereby gases may enter the casing solely through the apertures, a vertically inclined concavo-convexed baflle having an upper end fixed to the inner per-ipherygr' said duct above the upper aperture, said bafile inclining downwardly and inwardly of the duct from the upper portion of the duct across :the upper aperture and terminating above the lower; apere ture in the duct to deflect gases rising in the duct toward the upper aperture.

2, flhe combinationof claim 1 wherein said web portion is provided with a central opening,

and a cover plate pivoted to said web portion for selectively covering and uncovering said opening.-

EDWARD J. ARTIS.

References Cited thefile of this patent IJNITED STATES PATENTS France Sept. 27, 1921 

